Skip to content
Navigation Menu
{{ message }}
forked from pld-linux/python3
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathpython3-CVE-2013-4238.patch
More file actions
255 lines (243 loc) · 11.7 KB
/
Copy pathpython3-CVE-2013-4238.patch
File metadata and controls
255 lines (243 loc) · 11.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
# HG changeset patch
# User Christian Heimes <christian@cheimes.de>
# Date 1376693687 -7200
# Node ID c9f073e593b037e8a29e386326859537691bcf62
# Parent 3105b78d34346ea36c52a3b7e635954f4b444120
Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
inside subjectAltName correctly. Formerly the module has used OpenSSL's
GENERAL_NAME_print() function to get the string represention of ASN.1
strings for rfc822Name (email), dNSName (DNS) and
uniformResourceIdentifier (URI).
diff --git a/Lib/test/nullbytecert.pem b/Lib/test/nullbytecert.pem
new file mode 100644
--- /dev/null
+++ b/Lib/test/nullbytecert.pem
@@ -0,0 +1,90 @@
+Certificate:
+ Data:
+ Version: 3 (0x2)
+ Serial Number: 0 (0x0)
+ Signature Algorithm: sha1WithRSAEncryption
+ Issuer: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
+ Validity
+ Not Before: Aug 7 13:11:52 2013 GMT
+ Not After : Aug 7 13:12:52 2013 GMT
+ Subject: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
+ Subject Public Key Info:
+ Public Key Algorithm: rsaEncryption
+ Public-Key: (2048 bit)
+ Modulus:
+ 00:b5:ea:ed:c9:fb:46:7d:6f:3b:76:80:dd:3a:f3:
+ 03:94:0b:a7:a6:db:ec:1d:df:ff:23:74:08:9d:97:
+ 16:3f:a3:a4:7b:3e:1b:0e:96:59:25:03:a7:26:e2:
+ 88:a9:cf:79:cd:f7:04:56:b0:ab:79:32:6e:59:c1:
+ 32:30:54:eb:58:a8:cb:91:f0:42:a5:64:27:cb:d4:
+ 56:31:88:52:ad:cf:bd:7f:f0:06:64:1f:cc:27:b8:
+ a3:8b:8c:f3:d8:29:1f:25:0b:f5:46:06:1b:ca:02:
+ 45:ad:7b:76:0a:9c:bf:bb:b9:ae:0d:16:ab:60:75:
+ ae:06:3e:9c:7c:31:dc:92:2f:29:1a:e0:4b:0c:91:
+ 90:6c:e9:37:c5:90:d7:2a:d7:97:15:a3:80:8f:5d:
+ 7b:49:8f:54:30:d4:97:2c:1c:5b:37:b5:ab:69:30:
+ 68:43:d3:33:78:4b:02:60:f5:3c:44:80:a1:8f:e7:
+ f0:0f:d1:5e:87:9e:46:cf:62:fc:f9:bf:0c:65:12:
+ f1:93:c8:35:79:3f:c8:ec:ec:47:f5:ef:be:44:d5:
+ ae:82:1e:2d:9a:9f:98:5a:67:65:e1:74:70:7c:cb:
+ d3:c2:ce:0e:45:49:27:dc:e3:2d:d4:fb:48:0e:2f:
+ 9e:77:b8:14:46:c0:c4:36:ca:02:ae:6a:91:8c:da:
+ 2f:85
+ Exponent: 65537 (0x10001)
+ X509v3 extensions:
+ X509v3 Basic Constraints: critical
+ CA:FALSE
+ X509v3 Subject Key Identifier:
+ 88:5A:55:C0:52:FF:61:CD:52:A3:35:0F:EA:5A:9C:24:38:22:F7:5C
+ X509v3 Key Usage:
+ Digital Signature, Non Repudiation, Key Encipherment
+ X509v3 Subject Alternative Name:
+ *************************************************************
+ WARNING: The values for DNS, email and URI are WRONG. OpenSSL
+ doesn't print the text after a NULL byte.
+ *************************************************************
+ DNS:altnull.python.org, email:null@python.org, URI:http://null.python.org, IP Address:192.0.2.1, IP Address:2001:DB8:0:0:0:0:0:1
+ Signature Algorithm: sha1WithRSAEncryption
+ ac:4f:45:ef:7d:49:a8:21:70:8e:88:59:3e:d4:36:42:70:f5:
+ a3:bd:8b:d7:a8:d0:58:f6:31:4a:b1:a4:a6:dd:6f:d9:e8:44:
+ 3c:b6:0a:71:d6:7f:b1:08:61:9d:60:ce:75:cf:77:0c:d2:37:
+ 86:02:8d:5e:5d:f9:0f:71:b4:16:a8:c1:3d:23:1c:f1:11:b3:
+ 56:6e:ca:d0:8d:34:94:e6:87:2a:99:f2:ae:ae:cc:c2:e8:86:
+ de:08:a8:7f:c5:05:fa:6f:81:a7:82:e6:d0:53:9d:34:f4:ac:
+ 3e:40:fe:89:57:7a:29:a4:91:7e:0b:c6:51:31:e5:10:2f:a4:
+ 60:76:cd:95:51:1a:be:8b:a1:b0:fd:ad:52:bd:d7:1b:87:60:
+ d2:31:c7:17:c4:18:4f:2d:08:25:a3:a7:4f:b7:92:ca:e2:f5:
+ 25:f1:54:75:81:9d:b3:3d:61:a2:f7:da:ed:e1:c6:6f:2c:60:
+ 1f:d8:6f:c5:92:05:ab:c9:09:62:49:a9:14:ad:55:11:cc:d6:
+ 4a:19:94:99:97:37:1d:81:5f:8b:cf:a3:a8:96:44:51:08:3d:
+ 0b:05:65:12:eb:b6:70:80:88:48:72:4f:c6:c2:da:cf:cd:8e:
+ 5b:ba:97:2f:60:b4:96:56:49:5e:3a:43:76:63:04:be:2a:f6:
+ c1:ca:a9:94
+-----BEGIN CERTIFICATE-----
+MIIE2DCCA8CgAwIBAgIBADANBgkqhkiG9w0BAQUFADCBxTELMAkGA1UEBhMCVVMx
+DzANBgNVBAgMBk9yZWdvbjESMBAGA1UEBwwJQmVhdmVydG9uMSMwIQYDVQQKDBpQ
+eXRob24gU29mdHdhcmUgRm91bmRhdGlvbjEgMB4GA1UECwwXUHl0aG9uIENvcmUg
+RGV2ZWxvcG1lbnQxJDAiBgNVBAMMG251bGwucHl0aG9uLm9yZwBleGFtcGxlLm9y
+ZzEkMCIGCSqGSIb3DQEJARYVcHl0aG9uLWRldkBweXRob24ub3JnMB4XDTEzMDgw
+NzEzMTE1MloXDTEzMDgwNzEzMTI1MlowgcUxCzAJBgNVBAYTAlVTMQ8wDQYDVQQI
+DAZPcmVnb24xEjAQBgNVBAcMCUJlYXZlcnRvbjEjMCEGA1UECgwaUHl0aG9uIFNv
+ZnR3YXJlIEZvdW5kYXRpb24xIDAeBgNVBAsMF1B5dGhvbiBDb3JlIERldmVsb3Bt
+ZW50MSQwIgYDVQQDDBtudWxsLnB5dGhvbi5vcmcAZXhhbXBsZS5vcmcxJDAiBgkq
+hkiG9w0BCQEWFXB5dGhvbi1kZXZAcHl0aG9uLm9yZzCCASIwDQYJKoZIhvcNAQEB
+BQADggEPADCCAQoCggEBALXq7cn7Rn1vO3aA3TrzA5QLp6bb7B3f/yN0CJ2XFj+j
+pHs+Gw6WWSUDpybiiKnPec33BFawq3kyblnBMjBU61ioy5HwQqVkJ8vUVjGIUq3P
+vX/wBmQfzCe4o4uM89gpHyUL9UYGG8oCRa17dgqcv7u5rg0Wq2B1rgY+nHwx3JIv
+KRrgSwyRkGzpN8WQ1yrXlxWjgI9de0mPVDDUlywcWze1q2kwaEPTM3hLAmD1PESA
+oY/n8A/RXoeeRs9i/Pm/DGUS8ZPINXk/yOzsR/XvvkTVroIeLZqfmFpnZeF0cHzL
+08LODkVJJ9zjLdT7SA4vnne4FEbAxDbKAq5qkYzaL4UCAwEAAaOB0DCBzTAMBgNV
+HRMBAf8EAjAAMB0GA1UdDgQWBBSIWlXAUv9hzVKjNQ/qWpwkOCL3XDALBgNVHQ8E
+BAMCBeAwgZAGA1UdEQSBiDCBhYIeYWx0bnVsbC5weXRob24ub3JnAGV4YW1wbGUu
+Y29tgSBudWxsQHB5dGhvbi5vcmcAdXNlckBleGFtcGxlLm9yZ4YpaHR0cDovL251
+bGwucHl0aG9uLm9yZwBodHRwOi8vZXhhbXBsZS5vcmeHBMAAAgGHECABDbgAAAAA
+AAAAAAAAAAEwDQYJKoZIhvcNAQEFBQADggEBAKxPRe99SaghcI6IWT7UNkJw9aO9
+i9eo0Fj2MUqxpKbdb9noRDy2CnHWf7EIYZ1gznXPdwzSN4YCjV5d+Q9xtBaowT0j
+HPERs1ZuytCNNJTmhyqZ8q6uzMLoht4IqH/FBfpvgaeC5tBTnTT0rD5A/olXeimk
+kX4LxlEx5RAvpGB2zZVRGr6LobD9rVK91xuHYNIxxxfEGE8tCCWjp0+3ksri9SXx
+VHWBnbM9YaL32u3hxm8sYB/Yb8WSBavJCWJJqRStVRHM1koZlJmXNx2BX4vPo6iW
+RFEIPQsFZRLrtnCAiEhyT8bC2s/Njlu6ly9gtJZWSV46Q3ZjBL4q9sHKqZQ=
+-----END CERTIFICATE-----
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -55,6 +55,7 @@ BADCERT = data_file("badcert.pem")
WRONGCERT = data_file("XXXnonexisting.pem")
BADKEY = data_file("badkey.pem")
NOKIACERT = data_file("nokia.pem")
+NULLBYTECERT = data_file("nullbytecert.pem")
DHFILE = data_file("dh512.pem")
BYTES_DHFILE = os.fsencode(DHFILE)
@@ -162,6 +163,27 @@ class BasicSocketTests(unittest.TestCase
('DNS', 'projects.forum.nokia.com'))
)
+ def test_parse_cert_CVE_2013_4238(self):
+ p = ssl._ssl._test_decode_cert(NULLBYTECERT)
+ if support.verbose:
+ sys.stdout.write("\n" + pprint.pformat(p) + "\n")
+ subject = ((('countryName', 'US'),),
+ (('stateOrProvinceName', 'Oregon'),),
+ (('localityName', 'Beaverton'),),
+ (('organizationName', 'Python Software Foundation'),),
+ (('organizationalUnitName', 'Python Core Development'),),
+ (('commonName', 'null.python.org\x00example.org'),),
+ (('emailAddress', 'python-dev@python.org'),))
+ self.assertEqual(p['subject'], subject)
+ self.assertEqual(p['issuer'], subject)
+ self.assertEqual(p['subjectAltName'],
+ (('DNS', 'altnull.python.org\x00example.com'),
+ ('email', 'null@python.org\x00user@example.org'),
+ ('URI', 'http://null.python.org\x00http://example.org'),
+ ('IP Address', '192.0.2.1'),
+ ('IP Address', '2001:DB8:0:0:0:0:0:1\n'))
+ )
+
def test_DER_to_PEM(self):
with open(SVN_PYTHON_ORG_ROOT_CERT, 'r') as f:
pem = f.read()
@@ -294,6 +316,13 @@ class BasicSocketTests(unittest.TestCase
fail(cert, 'foo.a.com')
fail(cert, 'bar.foo.com')
+ # NULL bytes are bad, CVE-2013-4073
+ cert = {'subject': ((('commonName',
+ 'null.python.org\x00example.org'),),)}
+ ok(cert, 'null.python.org\x00example.org') # or raise an error?
+ fail(cert, 'example.org')
+ fail(cert, 'null.python.org')
+
# Slightly fake real-world example
cert = {'notAfter': 'Jun 26 21:41:46 2011 GMT',
'subject': ((('commonName', 'linuxfrz.org'),),),
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -771,12 +771,14 @@ static PyObject *
ext->value->length));
for(j = 0; j < sk_GENERAL_NAME_num(names); j++) {
-
/* get a rendering of each name in the set of names */
+ int gntype;
+ ASN1_STRING *as = NULL;
name = sk_GENERAL_NAME_value(names, j);
- if (name->type == GEN_DIRNAME) {
-
+ gntype = name-> type;
+ switch (gntype) {
+ case GEN_DIRNAME:
/* we special-case DirName as a tuple of
tuples of attributes */
@@ -798,11 +800,62 @@ static PyObject *
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
+ break;
- } else {
+ case GEN_EMAIL:
+ case GEN_DNS:
+ case GEN_URI:
+ /* GENERAL_NAME_print() doesn't handle NULL bytes in ASN1_string
+ correctly, CVE-2013-4238 */
+ t = PyTuple_New(2);
+ if (t == NULL)
+ goto fail;
+ switch (gntype) {
+ case GEN_EMAIL:
+ v = PyUnicode_FromString("email");
+ as = name->d.rfc822Name;
+ break;
+ case GEN_DNS:
+ v = PyUnicode_FromString("DNS");
+ as = name->d.dNSName;
+ break;
+ case GEN_URI:
+ v = PyUnicode_FromString("URI");
+ as = name->d.uniformResourceIdentifier;
+ break;
+ }
+ if (v == NULL) {
+ Py_DECREF(t);
+ goto fail;
+ }
+ PyTuple_SET_ITEM(t, 0, v);
+ v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_data(as),
+ ASN1_STRING_length(as));
+ if (v == NULL) {
+ Py_DECREF(t);
+ goto fail;
+ }
+ PyTuple_SET_ITEM(t, 1, v);
+ break;
+ default:
/* for everything else, we use the OpenSSL print form */
-
+ switch (gntype) {
+ /* check for new general name type */
+ case GEN_OTHERNAME:
+ case GEN_X400:
+ case GEN_EDIPARTY:
+ case GEN_IPADD:
+ case GEN_RID:
+ break;
+ default:
+ if (PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
+ "Unknown general name type %d",
+ gntype) == -1) {
+ goto fail;
+ }
+ break;
+ }
(void) BIO_reset(biobuf);
GENERAL_NAME_print(biobuf, name);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
@@ -829,6 +882,7 @@ static PyObject *
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
+ break;
}
/* and add that rendering to the list */
You can’t perform that action at this time.